Some advanced controls might not be completely implemented by vendors.
If the controls are a enumeration, UVC does not gives a way to probe
what is implemented and what is not.
Let's create a new callback function where heuristics can be implemented
to detect what is implemented and what not.
Reviewed-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
---
drivers/media/usb/uvc/uvc_ctrl.c | 10 +++++++++-
drivers/media/usb/uvc/uvcvideo.h | 5 +++++
2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index e59a463c2761..44ec185a8c8b 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -2360,7 +2360,7 @@ static int uvc_ctrl_add_info(struct uvc_device *dev, struct uvc_control *ctrl,
/*
* Add a control mapping to a given control.
*/
-static int __uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
+static int __uvc_ctrl_add_mapping_to_list(struct uvc_video_chain *chain,
struct uvc_control *ctrl, const struct uvc_control_mapping *mapping)
{
struct uvc_control_mapping *map;
@@ -2434,6 +2434,14 @@ static int __uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
return -ENOMEM;
}
+static int __uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
+ struct uvc_control *ctrl, const struct uvc_control_mapping *mapping)
+{
+ if (mapping && mapping->add_mapping)
+ return mapping->add_mapping(chain, ctrl, mapping);
+ return __uvc_ctrl_add_mapping_to_list(chain, ctrl, mapping);
+}
+
int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
const struct uvc_control_mapping *mapping)
{
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 6fb0a78b1b00..fa0396dd5b35 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -84,7 +84,9 @@
struct gpio_desc;
struct sg_table;
+struct uvc_control;
struct uvc_device;
+struct uvc_video_chain;
/*
* TODO: Put the most frequently accessed fields at the beginning of
@@ -123,6 +125,9 @@ struct uvc_control_mapping {
s32 master_manual;
u32 slave_ids[2];
+ int (*add_mapping)(struct uvc_video_chain *chain,
+ struct uvc_control *ctrl,
+ const struct uvc_control_mapping *mapping);
s32 (*get)(struct uvc_control_mapping *mapping, u8 query,
const u8 *data);
void (*set)(struct uvc_control_mapping *mapping, s32 value,
--
2.45.2.505.gda0bf45e8d-goog
